This is an IWC 3538 Aquatimer, which is no longer made. It has an all-titanium case, with thick sapphire crystal, that gives it the incredible water resistance down 2000 meters (6,666 feet). Because IWC believes in proper engineering, it achieves this depth rating without the need for a HRV. They also built it to withstand 60 atmospheres of negative pressure! It has a signed screw-down crown at 2 o'clock to set the time and quick-set date (at 3), and a self-sealing crown at 4 to operate the internal timer bezel. The bezel clicks solidly in minute intervals, unidirectionally, and is smooth as silk. The first 15 minutes of it are coated in luminous SLN, as are the clean handset. The matte black dial has SLN hour markers. Everything glows nicely all night long. The heart of the watch is its automatic movement. It is based on a ETA 2428-2, but has been so extensively re-worked and upgraded that IWC calls it a Cal. 30333. It comes on the full sized titanium bracelet that is the easiest to adjust ever made. This particular watch is keeping time less than three seconds a day vs NIST. It is a very stout watch that feels light on the wrist due to the ti construction, measuring about ~42mm across. These listed for over $4K new. It is not mint, although the pics taken today barely show a mark. With just a few light scuffs, I'd rate it TZ Excellent. Comes in the original leather box with a brass pusher to adjust the bracelet.
Asking $2,795 shipped overnight in USA!